Structural Water Enhanced Intercalation of Magnesium Ions in Copper Hexacyanoferrate Nonaqueous Batteries

Authors

Neal Walters Kuperman, Portland State UniversityFollow
Allison M. Cairns, Portland State UniversityFollow
Gary Goncher, Portland State University
Raj Solanki, Portland State UniversityFollow

Published In

Electrochimica Acta

Document Type

Citation

Publication Date

12-1-2020

Abstract

In this article we investigate copper hexacyanoferrate (CuHCF) as a nonaqueous magnesium ion battery (MIB) cathode, and the positive influence of structural water on its Mg2+ storage properties. The hydrated and dehydrated forms of CuHCF (H- and D-CuHCF) each displayed excellent rate capabilities and extended lifetimes with zero capacity loss. However, H-CuHCF delivers a specific capacity 25% higher than that of D-CuHCF. Cyclic voltammetry and galvanostatic charge discharge reveal a redox reaction present only in the hydrated CuHCF, which accounts for 25% of its total reversible capacity (63 mAh g−1 at 25 mA g−1). Furthermore, ex-situ FTIR reveals that the structural water of H-CuHCF remains in the lattice during charging/discharging. We propose that water provides partial electrostatic screening between the CuHCF lattice and Mg ions, while allowing an additional redox transition to become thermodynamically accessible.

Rights

Copyright © 2021 Elsevier B.V. or its licensors or contributors.

Locate the Document

https://doi.org/10.1016/j.electacta.2020.137077

DOI

10.1016/j.electacta.2020.137077

Persistent Identifier

https://archives.pdx.edu/ds/psu/34865

Citation Details

Kuperman, N., Cairns, A., Goncher, G., & Solanki, R. (2020). Structural water enhanced intercalation of magnesium ions in copper hexacyanoferrate nonaqueous batteries. Electrochimica Acta, 362, 137077. https://doi.org/10.1016/j.electacta.2020.137077